Question

Question #ccda2

Answer 1

I tried this:

Explanation:

We can use Newton's Second LAw and write:

`F=ma`

and from Kinematics:

`a=(v_f-v_i)/t`

or in numbers:

`F=1200*(27.78-0)/12=2778N`

The friction opposes the motion in a way that you need more force to get the same acceleration.

So, in our case the car needs to produce an extra:

`3000-2778=222N` to overcome friction which will exactly be:

`222N`